Brush and brush-holder for dynamo-electric machines.



.PATENTED MAR. a1, 1908. F. H. LORING. BRUSH AND BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES.

APPLICATION IILED NOVA. 1907.

dM .2-L

UNITE STATES;

l lllfilllalRlOli HENRY LOltlN G, Uh LON DON, ENGLAND.

Spoificatioxi of Letters Patent.

Patented Lil-larch 81, 1908.

Application. filed November l, 3.907. Serial No. 469,521

To all whom it may co tccm;

Be it Known that l, FREDERICK HENRY LORING, 'av citizen of the United States oi" Amcncs, residing at Doughty street, London, England, have invontsd new and usi-ii'ul lmprovonicnts in Bi'iishcs andBi'1isl'i--liol(lcrs for Dynamo-l lo?trio lilachiiics, of which the following is s ilocilicstiou.

My invention is of tho class lUlOWll as blUSlkllOlLlGI'S for tlyllzllllbQlOClFlCDlmflliI'lGS and comprises tho brush-hol lcr propor and tho brush thoi'clor, the latter being of carbon or like. iimtoi'inl.

llhc'ohjcct of my invention lo providc 21, combined brush and holder which is ohoap to nmnulsclmro; siinplo and compact in do sign; and more or loss lrocl'rom complicated and troublo mic scicw fixings, Doing easily iusortm'l in and ojcctcd from its holder While its alincmont in olldirections is accurately and automatically accomplished.

Freedom from rattle, good electrical contact with the brush, and a minimum of curbon WELSiLG arc further features of my improved. device. As the brush Wears away, the position of the contact lace rei'zmins unchanged, and the spring is applied a most advantsgeous point When several brushes are mounted on one stud, they may be set close to ouch other Without tlicircnds coming in. contact'and causing unnecessary lrictioni The accompanying drawing shows how my invontion may be carried out, according to ono example thoi'cof.

According to my invention, the lOWOl or body portion 3) of the carbon brush takes in gcncrul s roc-fmngulor scope, or has a rcctsn gulor cross-section and is provided with an extension or lilo-ad it, which is tapering and has a circular cross scction. Tho taper hood, practically intog :il port ol tho brush proper, fits into a. coma po iding taper socliot s. This tspci both oi" tho hi'ush said the socket can he moduccd by s tool 'WllllOlll) hand labor and thorsioro tho inm'mlacturo can hc'cz-iri'ied out at 1- minimum. cost and a good poi-nutrient lit is iusi'zrcd. 'lhc tspor socket is i'ustciiwl to a short arm, a loosely carried on :2 pin 97 situotod. in u i'iiitui'of sit-- tached to the usual hruslvholdcr-stud g. Situated over and pressing against the tupcr socket is n coilod or volutc spring 7c having an abutment against tho fixture f attached to tho ul'orosuid stud. An interinodiotc sci'ow t may ho employed. for adjusting the com )rossiou ofthos )i'in EXtGHCllD ncf the brush cisloly through the interim of the spring, little say down, is s lug or point g against which the brush may be raised by mud when it is desired to eject it.

l in ordor to keep the wearing face of tho brush fixed in space, iricspeciivc tho linusli-dcptli, I give the part show described as the rectangular or body portion o curved shape, the curved sides of which, if d0- vcloped into imugina circles-oi concentric tubes would have a common axis coincident with that of the pinsupporting the arm 1, a carrying the socket. To insure the insm-tion of tlfc brush so that its long side will he pasallcl with the commutator bars, I provido two cars which extond from one or opposiio sides oil the socket and which act as shouldocs against which one 01; both sides oi l'ho brush loosely rests. Ollie? mzins msy ho pi'ovidcd for pxsvcnting'i'ho brush from lumi ing round in its socli'ct, as fol example, lho taper pact may have. a groove 01' slit or roi. -d port to engage with a reverse part 01 indmii' :71- tion-tl1e one fitting into the other:

The Springs employed may be oi? tho yolurc cunciityor flexible copper conductors .2 he usod for connecting tho movable with the 'ststioniuy cart.

,. VA w v l he application of the spring dii octiy mm the bi'usli, wl1ilo LI1,& ClVM1l/&g8 ln some forms, i isy not necessarily be sdliciscd to, since it would perform substantially the some function it situated at one side. Either a spiral or aclocl-;sp1"ing may be ussd.

For convcnioncc in. adjusting tho sprii'igpicssuro, l may provide an EA instill '-scrow in :i hoss loimcd on part of tho llOlQGI tho scrow being; so phi-cod as to bottom in 8, cup ()l' ti imblo t lifted in the free land of the sprin lt. stop Z, secured in the main part YE/l arrangel in tho path of tho moving (i-1km may be provided. word movciiient of the arm, as the brush WSll'lS away, is checked at may predictorminczl point. Suitable liiigor-lips d, (if, prov cmbly in lino with cmh other, may oo providod to facilitate ihc liltin .ip of the brush and also to uli'ord at ready moons of ociing it.

Who? l claim isz---- l A current collecting brush comprisingu taper hood of circular cross section shaped to lit a. corrospimdingly tupcrod socket. and 2t contact port-ion of substantially i'octzmgulzu cross sm'tion attached to said head.

2. A womiuuiutor brush comprising a taper ily this moons his downllU to prevent rotation of the brush in said socket.

4. A brush holder comprising a fixture, a movable arm having a brush receiving socket therein, and an ejector arranged on said fixture in alineinent with said socket.

5.- A brush holder comprising a fixture ada ted for attachment to a brush holder stud an arm pivhted on the fixture and provided with a taper socket, a brush having a.

taper head fittin said socket, and an ejector arranged on the 'xture and adapted to enter said socket and remove the brush therefrom.

6. A brush holder com 'risi'ng a fixture, a brush carrying arm pivot-a ly mounted there on and provided with a brush receiving socket, an ejector arranged on the'fixture in alinement with said socket and adapted to enter the-latter to remove a brush therefrom, and

cooperatively arranged finger pieces on the fixture and the brush carrying arm for proximating them to efiect the ejecting o cration.

7. A brush holder comprising a. xture, a

brush carrying arm pivoted thereon, a brush mounted on said arm and having a contact ,portion curved concentrically with the axis of movement of said arm, and a helical spring inter osed between said armand the fixture and iiaving its axis arranged in substantial alinement with the brush.

8. A brush holder of the class described, comprising a fixture, a brush carrying arm pivotally mounted thereon and rovided with a brush receiving socket, a helical compression spring having its axis arranged in 'alinem ent with said socket and engaging the brush carrying arm, and a cap supported on the fixture and providing a seat for the op 0- site end of the spring, the cap being provi ed with an ejecting point arranged within the spring and in alinement with the brush receiving socket on said arm.

9. A brush holder of the class described, com rising a fixture adapted for attachment to a rush holder stud, a brush carrying arm pivotally mounted on the fixture and rovided with a brush receiving socket, a heiieal compression spring having one end surrounding the socket on said arm, a cap engaging the opposite end of said spring, a screw connecting said cap to the fixture and serving to adjust the compression of said spring, an ejector arranged within the said sprmg and in alinement with the brush receiving socket, and cooperatively arranged finger pieces on the fixture and brush carrying arm respectively, for proximating the said parts to eject a brush from said socket.

In testimony whereof I have hereunto set 

